Critical severity · published May 7, 2026
CVE-2026-42880
ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction
9.6
CVSS
0.6%
EPSS
No
On KEV
Description
Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AR
argo-cd · argoproj
>= 3.2.0, < 3.2.11; >= 3.3.0, < 3.3.9 · source: vendor
AC
Argo CD · Argoproj
3.2.0 before 3.2.11; 3.3.0 before 3.3.9 · source: NVD
RH
Red Hat OpenShift GitOps 1.19 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift GitOps 1.20 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Openshift Data Foundation 4 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42880
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42880
Exploit
https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3
access.redhat.com
https://access.redhat.com/errata/RHBA-2026:12433
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:20943
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:20947
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-42880
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2467882
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